We have one pond that is thriving. When we bought two ducks, I built a
second pond so the ducks wouldn't destroy the first pond. I don't have any
fish or plants in the duck pond - the ducks eat everything in sight. The
problem I have is the water is incredibly hard to keep clean. It isn't a
very large pond - about 300 gallons - and I have it filtered. Unfortunately
the filter is mucked up and clogged within 2 days of cleaning. I have tried
pond additives to kill the algae with little success. The water is bright,
fluorescent green and generally gross.

I realize the ducks are going to soil the water, but are there any
suggestions on how to aggressively clean the water without harming the
ducks? I don't intend to grow fish or plants in it, but the ducks swim and
drink from the pond.

Thanks